Reversing device.



H. NORTON, J. O. SPENCE 6: H. N. GUDWORTH.

REVERSING DEVICE.

APPLICATION FILED DEC. 28, 1908.

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CHARLES H. NORTON, JOHN C. SPENCE, AND I-IIRAM N. CUDWORTH, OFWORCESTER, MASSACHUSETTS, ASSIGNORS TO NORTON GRINDING COMPANY, OFWORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

REVERSING DEVICE.

Specification of Letters Patent.

Patented Nov. 16, 1909.

Application filed December 28, 1908. Serial N 0. 469,548.

To all whom at may concern:

Be it known that we, CHARLES H. NORTON, JOHN C. SPENoE, and HIRAM N.CUDwoRTH, citizens of the United States, all residing at Worcester, inthe county of Worcester and State of Massachusetts, have invented a newand useful Reversing Device, of which the following is a specification.

This invention relates to a machine for truing cylindrical and conicalsurfaces.

The principal objects of this invention are to provide means whereby apiece of work having a series of shoulders thereon can be trued orground accurately, and a large number of such pieces of work operatedupon uniformly after the mechanism has been adjusted or set for thefirst one, and to provide for truing up the several cylindrical orconical surfaces to the proper length, in-

dependently of the depth of the counterto dimensions with any greatdegree of ac- I curacy. The invention, however, is not limited to thisparticular class of work, but is capable of general use.

Further objects and advantages of the invention will appear hereinafter.

Reference is'to be had to the accompanying drawings in which,

Figure l is a side elevation of a grinding machine showing a preferredform of this invention applied thereto. Fig. 2 is a plan showing asample of work that can be performedvon the machine. Fig. 3 is a sideView of a portion of the reversing mechanism for the piece of work shownin Fig. 2. Fig.

4 is a plan of a portion of the. same, and

Fig. 5 is a sectional view on the line 5-5 of Fig. 3.

Although as has been stated, this invention is capable of general use,it is illustrated herein with particular reference to the grinding of amotor shaft, such for example as that illustrated in Fig. 2. This shaftis shown as provided near its ends with a series of cylindrical orconical portions a, b, c, d, e and f. Between the portions 0 and f are apair of shoulders connected by a cylindrical part 9. As is wellunderstood, articles of work of this kind, whether they are ground orturned, ordinarily are prepared for application to the machine by makinga prick punch in each end and countersinking'it. The countersunk hole isof varying depth, and ordinarily it is not used by the workmen as astarting point for making their measurements. \Vhen a piece of Work ofthis kind has to be ground or turned, the workman first measures fromthe end of the work a certain distance to the shoulder at the end of theportion a. Now it will be seen that on account of the variations in thedepth of the countersunk holes in the ends into which the center pointsextend it would be impossible to locate the grinding wheel in a certaindefinite relation to either center point, and secure uniform resultswith different pieces of work intended to be of the same size.

According to the present invention the table or carriage supporting thework is provided with means whereby a reversing mechanism is controlledso that after the work is first set for the truing of the portion a, forexample, the other portions will be trued to the proper length withoutany readjusting of the machine or work. This is accomplished byproviding a reversing bar having reversing dogs thereon at definitepredetermined distances apart corresponding to the several lengthsbetween of the work. In addition to this the bar is provided withadjusting means so that when the first piece of work, marked as aboveindicated, is set up with proper relation to the grinding wheel, nothingbut an adjustment of this reversing bar as a whole is necessary to getthe first shoulder of any subsequent piece into proper position withrespect to the grinding wheel. The machine will grind to the rest of theshoulders in a uniform manner.

Another feature of the invention relates to the grinding of the portionsat the end of the work which, during the first part of the operation,were held near the head center, as for example, the portions (Z, c and fin Fig. 2. For this purpose a second reversing bar is mounted on thetable or carriage substantially like the first except .for the distanceapart of the stationary dogs thereon, and it is provided with anadjusting device preferably connected with the first reversing bar sothat when the work is turned around in the machine the second bar can beadjusted up to the first shoulder, as at the end of the portion 03, inthe manner described above. It will be understood, of course, that thisadj ustment is possible only when the width of the portion 9 may varysomewhat.

The invention is shown as applied to a grinding machine having a bed 10,a grinding wheel 11, and work centers 12. The work centers are mountedon a table 13 so that the work can be caused to reciprocate in front ofthe grinding wheel which is ad justed by an adjusting device 14 of anydesired type. The bed carries means for controlling the position of thetable, as for ex ample, a reversing device.

Connected with the work table in fixed position is a table dog orbracket 20 adapted to be secured thereon by a handle 21 and a screw in awell known way. Although this dog is described as stationary or fixed,it is to be understood that it can be adjusted along a T-slot 22 in theside of the table and is intended to be fixed by the handle 21 and screwwhenever a job is to be started. After it is once fixed for theparticular work, it is not again disturbed and the adjustments aresecured in other ways as will be described hereinafter. Mounted on thisdog is a nut 23 carrying an adjusting screw 24; which engages in a nut25 on an adjustable reversing bar 26. One of the screw-threads on thescrew 24 is right-handed and the other lefthanded so that the rotationof the same will adjust the position of the bar 26 with respect to thetable and dog. This bar is provided with T-shaped members 27 removablyheld in position by screws 28 and working in the T-slot 22 so as to keepthe bar in proper position and to permit tightening the same after it isproperly adjusted. This bar is provided with a series of dogs 30thereon, and adjustable along the table with the bar. These dogs arearranged in line and are mounted at such distances apart that thereversing lever or other device 31 will be turned at the proper times tocause the carriage or table to shift the work the proper distance eachstroke. The reversing lever is shown in position for grinding the firstcylindrical portion of the right end of the piece of work shown in Fig.2.

The reversing lever is provided with ways 32 thereon in which moves aslide 33 having a pin 34 and a handle 35. This slide is normally in theposition shown in Fig. 3 so that the pin is engaged by the dogs 30 atthe ends of the stroke of the table. It will be understood, of course,that the distance between the ends of the dogs does not have to be quiteas great as the distance on the work which is to be ground because thelever has to be turned a definite distance by the motion of the tableafter the dog engages the pin 34; consequently, the dogs must be of suchlength and spaced at such distance apart as to give the proper time andspace for the turning of the lever and reversing of the table.

It will be understood of course that for dilierent kinds of standardpieces of work corresponding numbers of reversing bars will be kept instock so that on taking out the screws 28 and'disconnecting the screw24, the reversing bar can be replaced by another when the work is to bechanged. On many kinds of work a single bar having the necessary numberof dogs 30 will be all that is required but on a piece of work like thatshown in Fig. 2 when it is finished by grinding, it is desirable to havethe grinding wheel move up toward the several shoulders from the smallend and consequently after the work on one end is completed the work onthe other may be done under such circumstances that it is necessary tohave a slight adjustment between the dogs which control it and the dogswhich control the work on the opposite end. For this purpose a secondreversing bar 40 is shown constructed in accordance with the sameprinciples as those described above and provided with an adjusting screw41 like the screw 21 for adjusting it toward and from the reversing bar26. The way in which this additional bar is used will be obvious.

While we have illustrated and described a preferred embodiment of theinvention and the application of it to a grinding machine, we are awarethat many modifications may be made therein and that it can-be appliedto many types of machines without departing from the scope of theinvention as expressed in the claims. Therefore, we do not wish to belimited to all the details of construction or the particular applicationshown in the drawings, but

What we do claim is 1. The combination with a reciprocating table, and areversing lever, of a dog movable with the table, and a reversing baradjustably connected with said dog and having means for operating thereversing lever.

2. In a machine of the character described, the combination with areciprocating table 115 and a reversing lever, of a dog fixed on atable, and means for operating the lever adjustably connected with saiddog.

3. In a machine of the character described, the combination with areciprocating table 120 and a reversing device, of means movable withthe table and adjustable thereon for operating the moving device, saidmeans having a plurality of dogs fixed thereon for engaging the lever.

4:. In a reversing device, the combination of an adjustable bar, aplurality of dogs mounted at fixed distances apart on said bar, and areversing device adapted to be operated by said dogs.

5. In a reversing device, the combination of an adjustable bar, aplurality of dogs arranged at fixed distances apart on said bar, and areversing lever adapted to be operated by said d0gs,said reversing leverhaving a pin adapted to be located thereon in the path of the dogs, andmeans for moving said pin out of the way of the dogs.

6. In a reversing mechanisn'l, the combination of a reciprocable bar,fixed dogs thereon, a reversing lever, a slide mounted on said reversinglever, a pin on said slide adapted to engage said dogs when the slide isin normal position, and a handle connected with the slide for moving itto a position in which the pin will not engage the dogs.

7. In a machine of the character described, the combination of areciprocating table, a reversing lever, a reversing bar, a plurality ofsets of dogs mounted thereon at fixed and predetermined distances apart,each two of said dogs having a space between them for controlling thetravel of the table, whereby a piece of work can be operated upon for acertain distance with the lever between two of the dogs, and thenoperated upon for a certain distance with the lever between the next twodogs.

8. In a machine of the character described, the combination of areciprocating table adapted to support the work, and a reversing lever,of a reversing bar adjustably' connected with said table, and havingdogs fixed thereon for controlling the lever, and a second reversing barhaving fixed dogs thereon adjustably connected with the first reversingbar.

9. In a machine of the character described, the combination of areciprocating table, a pair of dogs adjustable together therealong and asecond pair of dogs adjustable along the table with respect to the firstpair of dogs.

10. In a machine of the character-described, the combination of areciprocating table, a reversing device, and a pair of reversing dogsimmovable with respect to each other, but adjustable together along thetable.

11. In a machine of the character described, the combination of a bed, atable movable thereon, means on the bed for controlling the position ofthe table, and a bar adj ustably mounted on the table and having meansthereon for engaging said controlling means and positioning the table-onthe bed.

12. In a machine of the character described, the combination of a bed, atable movable thereon, means on the bed for controlling the position ofthe table, and a bar adjustably mounted on the table and having aplurality of means in stationary position thereon for engaging saidcontrolling means and positioning the table on the bed.

In testimony whereof we have hereunto set our hands, in the presence oftwo subscribing witnesses.

CHARLES H. NORTON. JOHN C. SPENCE. HIRAM N. CUDIVORTH.

Witnesses ALBERT E. FAY, O. FoRREs'r WEssoN.

